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Comparison of three different models to represent the wrist during wheelchair propulsion
S D Shimada1, R A Cooper, M L Boninger
1Biomechanics Consulting, Davis, CA 95616, USA.
Summary
Investigating wheelchair propulsion biomechanics is crucial for preventing wrist injuries in manual wheelchair users. Different wrist models yield consistent flexion/extension but variable radial/ulnar deviation, highlighting the need for standardized methods.
Area of Science:
- Biomechanics
- Rehabilitation Engineering
- Human Movement Science
Background:
- Manual wheelchair users frequently experience secondary wrist injuries.
- Understanding wheelchair propulsion biomechanics is key to injury prevention.
- A standardized wrist biomechanical model is currently lacking.
Purpose of the Study:
- To compare the results of three distinct wrist biomechanical models.
- To assess the consistency of kinematic data across different modeling approaches.
- To inform the development of a consensual methodology for wrist biomechanics.
Main Methods:
- Three wrist models were developed: midstyloid joint center, de Leva's 2-DOF joint center, and a floating joint center.
- Wrist kinematics during wheelchair propulsion were analyzed using each model.
- Angular data for flexion, extension, radial deviation, and ulnar deviation were collected.
Main Results:
- Wrist flexion and extension angles showed high consistency across all three models.
- Significant variations were observed in radial and ulnar deviation angles between models.
- Mean maximum radial deviation ranged from 26.0 to 45.1 degrees, and ulnar deviation from 10.2 to 38.8 degrees.
Conclusions:
- The choice of wrist biomechanical model significantly impacts the assessment of radial and ulnar deviation.
- Standardized methodologies are essential for accurate and comparable kinematic studies in wheelchair propulsion.
- Further research is needed to establish a consensual wrist biomechanical model.